Straightening or bending apparatus.



No 675,369. Patented luma 4, 190i.

I ."R. L. AMB ROSE. STRAIGHTENING'OB BENDING APPARATUS.

(Airplicntion ma Apr. 19, 1900.)

2 Sheets-$heet I.

(n5 Iod el.)

in. 675,369. Patantod 1m 4, I90I.

- n. L. msnusa.

STRAIGII'I'ENII IG 0R SENDING APPARATUS.

' (Appiiution filed Apr. I9, 1000:) (lo llodel.)

onsai :nfmnnnOsn, or TARRYTOWN, NEW YORK, Assienon DRILE COMPANY,

,STRAIGHTENING OR'BENDING APPARATUS}? 1 OF NEW YORK, N. Y.

srncrrroarxon forming part of Letters Patent No. erases, dated June 4, 1901-.

I Application filed Aprl119, 1900; Serial No. 13,445. (No model.)

To all whom it may concern: I Be it known that I, ROBERT L. AMBROSE, a

citizen of the UnitedStates of America, and a resident of Tarrytown, county of Westch'ester, State of New York, have invented a new and useful Improvement in Straightening or Bending Apparatus, of which the following is a specification, referencev being had to the ac companying drawings, forming apart thereof.

My invention relates to improvements vin straightening or bending apparatus, 'and par ticularly' to improvements in power devices for straightening or bending metal bars.

My invention consists in the novel con-' struction and combination of parts, as will be hereinafter more fully set forth. I

1 will now proceed to describe a straightening or bending apparatus embodying my invention and will then point out the novel features in claims.

In the drawings, Figure 1 represents a view, partially in side elevation and partially in central vertical section, of a straightening or bending apparatus embodying myinvention. Fig. 2 is a rear View of the same. a horizontal section taken on the plane of the line 3 3 of Fig. 1. trating a straightening or bending apparatus embodying my invention applied for use.

Similar reference characters designate corresponding parts in all the figures.

Reference character 5 designates a cylin: der having a head or cover 6 suit-ably secured thereto, as by bolting. VVith'in the cy1inder5 is arranged a piston 7, which piston isadapted to have a limited reciprocating movement therein. Secured to the piston 7 1 is a piston-rod 8, which passes out through a suitable orifice arranged in a projecting hub of the cylinder-cover 6. A head 9 is secured to theend of the piston-rod 8i Pivoted' to lugs 10, projecting from the ;.rear end of the cylinder 5, is a lever constituting a bending-jaw 11. This bending-jaw 11 in the particular form or construction in which it is herein illustrated comprises two members. The members may, if desired, be connected together in any suitable manner. Asshown in the drawings, they are connected together near their lower ends,'a'nd hencc'act as one lever or bending-jaw having two bond- Fig. 3 is Fig. 4c is a view illus-' to Fig. 3.

ing-faces. The bending-jaw 11 at its lo,wer end supports 1 ing-boxes 12 are secured to, the" bending-jaw 11 by being fitted one'to each member thereof. and. partially embracing same ,and' by means of clamping-bolts which pass through plates 13, fitted to the outside. off saidlhirn bers and which are tapped into thesaidbean ing-boxesu A nut 14, having trunnions 15, is journaled in the said bearings, the trunnions 15 fitting the said bearings and arranged to have an axial movement therein.

A bending-jaw 16 is pivotally secured to the head 9 upon the piston-rod Sand is suspended therefrom oppositeto thebendingjaw 11. The lower end of the bending-jaw 16 is located between the two endsof the two members of the said bending-jaw 11, andthe said bending-jaws 11 and 16 are arranged to face each. other and to 'move' toward and away from each other.

An adjusting-bolt 17 is mount d inanorifice 18 in the lower end. of the bend=ing-jaw 16, the said orifice 18 being preferably'somewhat tapered, as shown, the diameter thereof being larger at the inside of the bending-jaw than at the outside. The ad justing bolt 17 is screw-threaded at its inner end, and such screw-threaded portion engages with the nut 14, as will be seen more clearly by reference A'hand-wheel is secured torthe outer end of the bolt to permit the ready turning of same. A washer is also provided near the front end of the adjusting-bolt "17, the rear face of the washer having a convexportion. The convex face of the washere-ngages with a concave surface 19, which-is arranged in the outer face of the bending-jaw-IB. {like coaction of these convex. and concave ,surfaces permits suchrelative movementof the parts as is desirable. l i 7 Secured to the upper endof the bendingjaw 16 and extending beyond=the opposite side of its pivotal connection withthe head 9 is an arm 20. A yoke 21 vis bolted to the said arm 20 and supports one endof acornpression-spring A rod 23, secured to the cylinder-cover 6,'passes through thee nd of the said yoke and is provided .with ahead 24, against which the opposite end of the. spring "2:? bears. The spring is coiled around the bearing-boxes 12. The .bearrod 23. This compression-spring 22 exerts its force to press the arm 20 toward the cylinder 5,-and hence to swing the end of the bending-jaw 16 forwardly or outwardly.

Upon the rear or opposite side of the cylinder 5 is arranged a valve-easing 25, and mounted in the valve-casing 25 is a distributing-valve 26. A suitable inlet :27 is provided for a supply of the motive fluid.

I preferably employ air under pressure as the motive fluid, but may employ other niotive fluids, such as steam, if desired.

A port 28 leads from the interior of the valve-casing to the interior of the cylinder 5. As shown in Fig. 2, in which figure the parts are in their out of operation position,'the port 28 will at such times be in communication with the atmosphere through the open end of the valve-casing 25. By depressing the front end of the lever 29 the valve 2b may be raised and the port 28 placed in communication with the inlet for the motive fluid. A release of the valve 29 will cause the parts to resume theirnormal position-that is to say, the valve 25 will be moved downwardly by the return action of the spring 30 and the front end of the lever 29 again lifted.

I have shown the cylinder-cover as having orifices in order to permit the escape to atmosphere of air which may have passed by the piston and which otherwise might tend to balance the same by exerting pressure on both sides thereof.

In using the device I preferably suspend the same from an overhead beam, a suitable suspension-wheel 31 being secured to lugs 32 upon the upper end of the cylinder 5 and the said suspension-wheel being arranged to engage with said beam to permit the read y movement bodily of the straightening or bending apparatus. An illustration of such arrangement is shown in Fig. 4, in which 33 designates the beam upon which the straightening or bending apparatus is suspended. A main inlet-pipe for the motive fiuid is shown at 31t, and a flexible hose connection may be used to permit the movement of the device.

. The operation of the device is as follows:

It being desired to bend -or straighten a bar of metal, the said bar may be placed transverselyof the device or the device may be located transversely of the bar to be bent, as the case may be, with the lower end of the bending-jaws 11 and 16 of the said bar. I have shown notches in the bending-faces at the lower end of the said bending-jaws 11 and 16, as at 36, which constitute supports for the said bar, in order to correctly locate the same and to prevent accidental displacement thereof during the operation of straightening or bending it. The bar having been correctly located, the adjustingbolt 17 may be adjusted as required by means of the hand-wheel provided therefor and motive fluid may be admitted to the cylinder 5 behind the piston 7. The piston 7 will now be driven forward with great power and the upon opposite sides upper ends of the bending-jaws l1 and 16 will be forced apart. This will force the lower ends together, rocking the bending-jaw 11 7'0 upon the nut-trunnions 15 and the bendingjaw 16 upon the universal joint 19. The bending-jaws 11 and 16 are thus levers of the first order, the power being applied at 10 and 9, the fulcra being at 14 and 19, and the work at 36. By reason of the large area of the piston 7 andthe great leverage of the bending-jaws 11 and 16 an enormous force willbe exerted to bend the bar supported in the notches 36. The extent that this bar may be bent at each stroke is a matter of very easy calculation. In practice I make the stroke of the piston 7 about two inches. The purchase of the bending-jaws 11 and 16, figuring the leverage in a straight line between the centers of the 8 notches 36 and the point at which the power is applied, is about as eight is to one. Hence the full movement of two inches of the piston 7 will give a movement of about a quarter of an inch to the bending-faces opposite the 9 notches 30. Assuming the pitch of the thread of the adjusting-screw to be one-half of an inch, it will readily be seen that to so adjust the device as to bend the baronc-tpiarter of an inch it would merely be necessary toscrew g the adjusting-bolt 17 until the notches 36 firmly grasp the bar and then to turn the adjusting-bolt back one-quarter of a revolution.

The particular use to which I have thus far applied my invention is to that of straightening the piston of power rock-drills. For this purpose I preferably mount the piston between the centers of a lathe and suspend the straightening device over it so that the centers of the bemling-faces opposite the notches 'l come in a line with the lathe-centers. This is shown more clearly in Fig. 4:. By revolving the piston I am enabled to tell exactly how much it is necessary to bend same in order to straighten it, which I can then do by properly adjusting the straightening device and operating it as just described. After the piston has been acted upon I may again rotate it,and I may then again apply the straightening device, and so on until 'tllO said piston has been completely straightened.

\Vhen not in use, I can readily remove th device out of the way by reason of the man ner in which it is suspended from the over head beam.

I have for purposes of this specification de scribed the bending-jaw 11 as being a singl lever having two members, the said member being connected together. Various lnodii' cations in the form and construction of thi bending-jaw may of course be resorted t within the scope of my inven lion, as will b obvious to those skilled in the art to whic this invention appertains. It is also course obvious that the arrangement of th bending-jaws l1 and and that the bending-jaw 1] ported from the head J and 10 from the lugs 10. Ancssential feature mounted therein, of two fulcrumed bendin modifications, and I do not, therefore, desire to be limited to the exact form or .construction as describedand shown herein.- Variations of-same within wide limits .maybe made without departing from the spirit and scope of my invention. I

What I do claim, and desire to secure by United States Letters-Patent, 'is--- 1. In astraightening or bending apparatus. the combination with a cylinder and a piston mounted therein, of two fulcrumed bendingjaws, the one connected to the cylinder and the other to thepiston.

-2. In a straightening or bending apparatus the combination witha cylinder and a piston mounted'therein, of two fulcrumed bendingjaws, the one connected to the cylinder and the other to the piston, one of the said jaws having two bending-faces, and the other having a single bending-face arranged between the two bending-faces of the other jaw.

3. In a straightening or bending apparatus the combination with'a cylinder and a piston mounted therein, of two fulcrumed bendingjaws, the one connected to the cylinder and the other to the piston, and an independent v adjustment 'for one of the said jaws toward and away from the other of said jaws.

4. In a straightening or bending apparatus the combination with a cylinder and a piston jaws having bending-faces, one of said jaws connected to the cylinder and the other to the piston, and means for adjusting the bending-facesof said jaws toward and away from each other, independently of the movement of said piston in said cylinder.

5. In a straightening or bending'apparatns thecombination with a cylinder and a piston mountedtherein, of two bending-jaws, the

one connected to the cylinder and the other to the piston, a fulcrum for each of said bendthereof, the former bendinging-jaws upon which the said jaws are adapted to rock, and means for adjusting the said fulcra toward and away from each other. I

6. In a straightening or bending apparatus the combination with a cylinder and a piston mounted therein, of two fulcrumed bending jaws, the one connected to the cylinder and the otherto the piston, an adjusting-bolt carried by one of said jaws and a nut with which the said bolt is adapted to engage, carried by the other of said jaws. Y

7. In a straightening or bending apparatus the combination with a cylinder and a piston mounted therein, of two bending-jaws, the one connected to the cylinder, and the other to the piston, an adjusting-bolt carried by one of said jaws, the said jaw being fulcrumed thereon, and a nut with which the said adjusting-bolt is adapted to engage, and upon which the other of said jaws is fulcrumed.

8. In a straightening or bending apparatus the combination with a cylinder and a piston, of two bending-jaws, the one connected to the cylinder and the other to the piston, bearingboxes carried by one of said jaws, a threaded nut having trunnions supported in said bearings, andan adjusting-bolt carried by the other of said jaws, said bolt having a yielding connection with the jaw by which it is carried and adapted to engage with the said threaded nut.

9. In a straightening or bending apparatus the combination with a cylinder and a piston, of two bending-jaws, one of the said jaws C0111- prising two members, each member having a bending-face, and the other of said jaws comprising a single member having a single bend: ing-face, one of said jaws connected to the cylinder and the other to the piston, bearingboxes carried, one each by the two members of the said first-mentioned jaw, a threaded nut having trunnions supported in said bearings, and an adjusting-bolt carried by the other of said jaws, said bolt having a yielding connection with the jaw by which it is carried and adapted to engage with the said threaded nut.

ROBERT L. AMBROSE.

Witnesses:

HUGH V. CONRAD, W. S. BARXUJI. 

